Update: Apple fixed this in iTunes 11.1.2.
Let’s say you’ve just bought some music by download: from the iTunes Store, or from any other purveyor of digital music. You may get more than just music: you may get a digital booklet (a PDF file replicating liner notes), or even a music video. These are different types of media: the music is audio files, the digital booklet is a PDF, and the video is, well, a video.
Previously, you could select all these items and tag them. So if you wanted to change the album or genre tag, for example, for the music, PDF and video, you could do it all at the same time. After all, you probably want the PDF to be stored in your Music library, which makes it easy to find. (That’s where digital booklets go, by default.)
Now, since the latest version of iTunes (11.1), you can no longer do this. If you select multiple types of media, you’ll see a dialog like this:
So from now on, you’ll need to tag each type of media individually. Unless Doug Adams of Doug’s AppleScripts for iTunes comes up with a script to make this easier…